The actor-and-writer admits he relies heavily on marijuana during the creative process of a film because it relaxes him and takes away the pressure.
Seth - who wrote and stars in new movie `50/50` - told MTV News: "I smoke a lot of weed when I write, generally speaking. I don`t know if it helps me write. It makes me not mind that I`m writing. And I don`t know if it makes me work better, but it makes me not care that I`m working. Who wants to work? But if you`re stoned, it doesn`t seem like work."
Seth says smoking cannabis is nothing new to him as all his friends do it.
"I think a lot of people smoke weed. I think way more people smoke weed than the media likes to acknowledge. Maybe it`s just the people I`m around, but I don`t think so. Pretty much everyone that I know smokes weed sometimes - with the exception of my parents."